刚学习php不久，请大神指教！ 无 ?php/** * 精简版加密/解密类 * @author 布衣 QQ 780998900 * @packge SimpleTools * @link http://commoner.cn 布衣博客 * @copyright http://commoner.cn */class SimpleCrypt{ /** * 密钥 * 越复杂越好，但字符串长度会整
刚学习php不久，请大神指教！
<?php
/**
* 精简版加密/解密类
* @author 布衣 QQ 780998900
* @packge SimpleTools
* @link http://commoner.cn 布衣博客
* @copyright http://commoner.cn
*/
class SimpleCrypt{
/**
* 密钥
* 越复杂越好，但字符串长度会整加
* @var String
*/
private static $key = 'jdkhvxdicstui';
/**
* 用于生成随机字符串
* @var array
*/
private static $word = array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','v','u','w','x','y','z','A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','V','U','W','X','Y','Z');
/**
* 加密算法
* @param $str 需要加密的字符串
* @return String 加密后的字符串
*/
public static function encode($str){
//首次加密
$str = base64_encode($str);
//计算字符串长度
$str_num = mb_strlen($str);
//取一半长度
$half = ceil($str_num / 2);
//获取前半和后半字符串
$head_str = substr($str , 0 , $half);
$end_str = substr($str , $half , $str_num);
//计算前半和后半加密次数
$head_loop_num = $half < 50 ? ceil($half / 5) : ceil($half / 10);
$end_loop_num = $str_num > 200 ? ceil($str_num / 10) : ceil($str_num /8);
//生成随机字符串
$head_rand_loop_num = ($head_loop_num * 10) - $head_loop_num;
$end_rand_loop_num = ($end_loop_num + $head_loop_num) * 10 - $end_loop_num;
$head_rand_str = null;
$end_rand_str = null;
//前半部分随机字符串
for($i = 0 ; $i < $head_rand_loop_num ; $i++){
$head_rand_str .= self::$word[rand(0 , 51) ];
}
//后半部分随机字符串
for($i = 0 ; $i < $end_rand_loop_num ; $i++){
$end_rand_str .= self::$word[rand(0 , 51)];
}
//前半部分内容加密
for($i = 0 ; $i < $head_loop_num ; $i++){
$head_str = base64_encode($head_str);
}
//撕毁变量
unset($i);
//后半部分内容加密
for($i = 0 ; $i < $end_loop_num ; $i++){
$end_str = base64_encode($end_str);
}
//合并
$implode_str = $head_rand_str . $head_str . self::$key . base64_encode($head_loop_num) . self::$key . base64_encode($end_loop_num) . self::$key . $end_str . $end_rand_str;
$result = base64_encode($implode_str);
//以后继续，先返回
return $result;
}
/**
* 解密算法
* @param $str 需解密的字符串
* @return String 解密后字符串
*/
public static function decode($str){
//获取加密信息
$get = explode(self::$key , base64_decode($str));
$head_str = $get[0];
$end_str = $get[3];
$head_loop_num = base64_decode($get[1]);
$end_loop_num = base64_decode($get[2]);
//去除随机字符串的算法
$head_rand_num = ($head_loop_num * 10) - $head_loop_num;
$end_rand_num = ($end_loop_num + $head_loop_num) * 10 - $end_loop_num;
//去除随机字符串，获取原文
$head_str = substr($head_str , $head_rand_num , strlen($head_str));
$end_str = substr($end_str , 0 , strlen($end_str) - $end_rand_num);
//解密前半部分
for($i = 0 ; $i < $head_loop_num ; $i++){
$head_str = base64_decode($head_str);
}
//撕毁变量
unset($i);
//解密后半部分
for($i = 0 ; $i < $end_loop_num ; $i++){
$end_str = base64_decode($end_str);
}
//合并并解密
$result = base64_decode($head_str . $end_str);
return $result;
}
}
?>
